Re: Bushes - Bushes are optional however as your car is getting on near 10 yrs, most likely the suspension bushes have never been changed and by now will be squashed/worn so it will revitalise your car's handling and behaviour. If you're unsure, go underneath the car and check the condition of various suspension bushes for fraying/cracks/etc.
Re: Swaybars - Hollow or Solid it doesn't matter too much for you however hollow are lighter but less effective ie to match the rigidity of the solid, you have to go larger in diameter of a hollow. It's just something to know about
Re: Koni - You have to be careful, usually with most companies there is Geo-Blocking ie Within country of purchase so if you bought from say Koni USA then your warranty might be valid only to them. This might not be the case with Koni but best to check
#01 - Like the others have mentioned, in general, you'll notice the body roll is minimised or eliminated. Get your combination wrong though and your car can become oversteer/understeer prone.
#02 - Only a RSB or both FSB and RSB is highly dependent on your car's factory setup and your driver preference. In general, FWD cars tend to be understeer bias from factory. Adding just a RSB, if the sizing is done correctly against the factory FSB, the car can be neutral or bias towards oversteer. IF you go too big with RSB and makes your FWD car a little too tail nervous, you can counter with a thicker front sway =)
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